Group: Normet Group
Catalog excerpts
Technical data sheet February 2014 General description The D-Bolt is a rock reinforcement element comprised of a smooth steel bar with a number of deformed sections that act as anchor points along its length. The collar end of the D-Bolt is threaded and is designed to be used with a face plate, spherical washer and a nut that fastens the bolt. The bolt is fully encapsulated in a borehole, but it is only constrained to the grout or resin along the anchor points. This allows the smooth sections of the bolt, between the anchor locations, to deform without constraints and absorb energy as the rock mass dilates. Functionality The D-Bolt reinforces the rock mass by constraining the dilation between the anchor points. When the rock mass dilates, the anchor points assume the load and the smooth sections between the anchor points stretch. The load on the smooth sections increases quickly with a small increase in the dilation, until the yield load is reached. Once the yield load is reached the smooth sections undergo plastic elongation until failure. The D-Bolt absorbs the dilation energy by fully mobilising the strength and deformation capacities of the bolt material. The smooth sections of the D-Bolt provide localised and independent reinforcement to the surrounding rock mass. This has the important advantage whereby failure of one section of the bolt would not affect the reinforcement function of other sections along the length of the bolt. The anchor points are designed to mix two-component cartridge resins when the D-Bolt is spun into the borehole. The D-Bolt steel is manufactured using micro-alloyed, engineered carbon steel using specific properties that result in an optimal combination of yield strength, ultimate tensile strength and elongation. D-Bolt is also available with a hot dip galvanized (HDG) and/or powder coating that provides further resistance to corrosion. Typical applications The D-Bolt can be used as an effective rock reinforcement element in underground excavations. As a result of its unique ability to both withstand high static load and absorb dynamic energy, it is particularly suited in areas prone to large deformations in the rock mass, including rock burst and squeezing rock areas. D-Bolt can be installed with standard mechanized bolting equipment, as well as manually, in both cementitious grout and resin. Normet reserves the right to change this specification without further notice. Normet International Ltd. Rothusstrasse 21 CH-6331 HÜNENBERG, SWITZERLAND
Open the catalog to page 1Technical data sheet Technical performance data Based on the steel specification Based on laboratory test results Typical static performance Typical dynamic performance D-Bolt diameter: D-Bolt section: D-Bolt diameter: D-Bolt section: Drop weight: Drop velocity: Energy absorption: Normet reserves the right to change this specification without further notice.
Open the catalog to page 2Technical data sheet February 2014 Dimensions, packing, threads Diameter and length Standard pack Bar/anchor diameter, metric: 20/27 mm 22/30 mm Bolts per back Strapped with steel bands. Bar/anchor diameter, imperial: (Americas) Standard lengths: 1700 to 3000 mm (Longer lengths and connectable D-Bolts available on request.) Section lengths between anchor points: Standard 500 - 1500 mm (Section lengths can be adjusted to tailor individual rock mass conditions and bolt length). Standard weigth Diameter 20 mm 0.8125" 22 mm 7/8" Thread type, diameter and dir. M22x2.5 clock-wise (CW) M22x2.5...
Open the catalog to page 3Technical data sheet February 2014 Accessories Nuts • tandard hex nuts for M22x2.5 and M24x3.0 threads. S • Kiruna wedge, Ø20x120 for immediate support in cement grout, load-bearing capacity approx. 30 kN. • Driver nuts: - Normet HEX driver nut for M22x2.5 thread. Proof load 300 kN W/ integrated Ø50 mm spherical seat Break-out torque (BOT) low 75 - 105 Nm BOT medium 105 - 145 Nm • North America: - Socket size 36 mm/ 1"7/16, impact resistant 6 pt/12 pt driver, hex 25, 84 cm long for bolters. - Socket size 36 mm/ 1"7/16, impact resistant 6 pt/12 pt driver, hex 22, 60 cm for hand held drills....
Open the catalog to page 4Technical data sheet February 2014 Example instructions for installing the D-Bolt using resin grout Recommended borehole diameter range • D-Bolt Ø20 / 0.8125": • Bolt is inserted into the borehole following site specifics procedures and equipment. General procedure • Bolt is spun into the borehole until the nut and plate are close to the rock surface/mesh, approximately 20 to 50 mm. • Bolt is spun for an additional 5-15 revolutions after stop of advance. - 1-3 seconds for mechanized bolters - 3-4 seconds for hand held equipment Recommended resin cartridge diameter D-Bolt dia. Bore hole dia....
Open the catalog to page 5Technical data sheet February 2014 Instruction for resin grouting of D-Bolt (example with left hand thread) 1. Insert one or two FAST cartridge(s) to the bottom of the hole and SLOW cartridges to the rest of the hole. 2. Push and spin the bolt into the hole. Find the proper insert time in the chart of insert time. 3. Continue to spin the bolt for at least 5-10 revolutions after the bolt reaches the bottom. Stop rotation and hold the bolt until the FAST resin hardens and then rotate the nut to apply a small tension load. Normet reserves the right to change this specification without further...
Open the catalog to page 6Technical data sheet February 2014 General instructions for installing the D-Bolt using cementitious grout Recommended borehole diameter range General installation procedure • Bolt is inserted into the borehole as needed, depending of equipment and dimensions of excavation, see illustrations below. • Bolt must be fully incapsulated in the hole. Recommended water/cement ratio • Min. 0.35 - max. 0.40 Visual instructions for cementitious grouting of D-Bolt 1. Pump the cement grout with hose from bottom until the hole is completely filled. 2. Insert D-Bolt up to the bottom of the borhole...
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